Horn blowing 2003 Vitara came home went into house, heard this noise it was my horn blowing, sat in the drivers seat, it stopped, got out, shut the door, got to the house, it started again, disconnected fuse, next morning put fuse back in, all was quiet, the next morning my daughter opened door, horn started blowing, sounded weak, stopped, pulled wire to disconnect horn. ???? This truck has been a jem, it is a soft top three door.

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Try opening the door from the outside (or get someone else to do it for you) whilst sat in the car to see if it still does it. Then lift yourself off the seat and see if it stops. If it does stop whilst you are not sat down it may be a problem linked to the seat occupancy switch that activates when you sit down.

It happens a lot for the Tiburon apparently....what you have to do is put the key in the ignition whilst the horn is going nuts, turn the key to the "on" position and wait a minute or so for the horn to stop blowing. Then press the "unlock" button on the fob until you see the turn signals flash. try turning the key over and see if it will start up. If it doesn't, try again, same thing only turn the key all the way off and try starting as normal again. I can't remember if it's the "unlock" or "lock" button you're supposed to press, but one of them does it. Test it while in the car and see if it locks when you hit lock on the fob.....oh, and also make sure all the doors are shut while you are doing this. It recalibrates the fob to the car's computer and resets your security system and keyless entry.

I know a quick fix to get it started but you might think i'm crazy to do this:

My 2003 Dodge ram van 1500 does the same thing. I put a small heater on the driver's side floor blowing the hot air toward the door.
I plug in the heater when I get home from workand let it run all night.The computer for the alarm is under a kick plate near the driver's door next to the driver's seat on the left side. Once it warms up the alarm; it will shut off the alarm and you can start the motor.

Horns have constant power all the time so when you press the horn button, all you are doing is grounding the circuit and that makes the horn blow. Usually what happens is that a spring breaks underneath where the horn button is or something allows the horn button to ground out somewhere, possibly even through the inside of the steering column.

I think your horn relay is making contact from behind your horn buttons on your steering wheel. Usually as time creeps up the insulation that is placed on the positive lead for the horn gets worn out from constant horn action. If it is worn down the horn is touching a ground and completing the circuit and thus making the horn sound. I would start with that first before getting more technical. Let me know. Gabe

this is a common problem if you use the seat heater alot.one or both of the seat heater elements will have burned up or broken.where i live it is very cold most of the time and i have replaced hundreds of the seat heater elements.it is rare for it not to be one or both of the elements.